The equation "Y = 2X + 4" represents a linear relationship between the variables Y and X. In this equation, Y is dependent on the value of X. The number 2 indicates the slope of the line, meaning for every increase of 1 in X, Y increases by 2. The number 4 is the y-intercept, which is the point where the line crosses the Y-axis when X is 0. This equation can be graphed on a coordinate plane, where the horizontal axis represents X and the vertical axis represents Y. The line will rise steeply due to the slope of 2, starting at the point (0, 4) on the Y-axis. This visual representation helps to understand how changes in X affect Y.